Ignore jumps that have side effects in loop processing as pasting the body of a loop multiple times within is semantically equivalent to jump deletion (between the iterations unrolled) even if we do not physically delete the jump RTL insn.
gcc/ * loop-iv.c (simplify_using_initial_values): Only process jumps that match `onlyjump_p'. (check_simple_exit): Likewise. --- gcc/loop-iv.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) gcc-loop-iv-only-jump.diff Index: gcc/gcc/loop-iv.c =================================================================== --- gcc.orig/gcc/loop-iv.c +++ gcc/gcc/loop-iv.c @@ -1936,7 +1936,7 @@ simplify_using_initial_values (class loo while (1) { insn = BB_END (e->src); - if (any_condjump_p (insn)) + if (any_condjump_p (insn) && onlyjump_p (insn)) { rtx cond = get_condition (BB_END (e->src), NULL, false, true); @@ -2887,7 +2887,7 @@ check_simple_exit (class loop *loop, edg return; /* It must end in a simple conditional jump. */ - if (!any_condjump_p (BB_END (exit_bb))) + if (!any_condjump_p (BB_END (exit_bb)) || !onlyjump_p (BB_END (exit_bb))) return; ein = EDGE_SUCC (exit_bb, 0);